This letter to the editor of the Post echoes some of what Karl Rove noted in his WSJ piece.  The letter argues that

[a] thoughtful study of the appropriate use of new technologies by the government to promote agendas seems to be in order. We need guidelines, and in my view those guidelines need to err on the side of conservative use of online media in promoting government policies. The government needs to hear from everyone, and there are legal frameworks for those public comments to be evaluated.

Going outside of those mechanisms raises serious policy issues.

The CRS Report, “Public Relations and Propaganda:  Restrictions on Executive Agency Activities,” is available here.